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Measurement of natural radioactivity in Brazilian beach sands

2005; Elsevier BV; Volume: 41; Issue: 2 Linguagem: Inglês

10.1016/j.radmeas.2005.05.001

1879-0925

R. Veiga, N. F. Sanches, R. M. Anjos, Kita Macário, J. Bastos, M. Iguatemy, J.G. Aguiar, A.M.A. Santos, B. Mosquera, Carla Carvalho, Milton Baptista Filho, Nancy K. Umisedo,

Graphite, nuclear technology, radiation studies

The distribution of natural radionuclide γ-ray activities and their respective annual effective dose rates, produced by 40K, 226Ra and 232Th, were determined for sand samples collected along the coast of four Brazilian States: São Paulo (SP), Rio de Janeiro (RJ), Espírito Santo (ES) and Bahia (BA). For some specific beaches, the values of the annual effective dose rates or γ-ray radiation hazard indices exceed the average worldwide exposure of 2.4mSvy-1 due to natural sources and the limits proposed by Organization for Economic Co-operation and Development for building materials. The average values of the radium equivalent activities were evaluated and found to be 696Bqkg-1 in Mambucaba (RJ), 1621Bqkg-1 in Buena (RJ), 2289Bqkg-1 in Anchieta (ES), 10205Bqkg-1 in Meaipe (ES), 83425Bqkg-1 in Guarapari (ES), 531Bqkg-1 in Vitória (ES), 2026Bqkg-1 in Serra (ES), 3240Bqkg-1 in São Mateus (ES), 3075Bqkg-1 in Porto Seguro (BA) and 1841Bqkg-1 in Itacaré (BA). These values are above the limit of 370Bqkg-1 recommended for the safe use of building materials for dwellings by OECD.